I got this message for second time with my facebook account. I am little unsure whether the problem caused due to firefox or from any phishing site. I am getting this error while trying through firefox. Anyhow, Facebook proves the stealthy security system in place 
that makes me bit comfort. It takes me through 4 steps to activate my locked account.
Verifying the Date of Birth, Primary email address configured and finally an email will be dispatched with the link to enter your new password. That is all it takes. This automatic locking system is effective but it will make any one bit scared at the first shot. It is also advisable to check with your primary email address to change its password from the older one. If it is Gmail, then check for any recent unknown ip logins through the footer of your gmail account page. The IP details will reveal whether any other person have logged into your account or not. These must be done in no time. Delaying may let the hacker to take control of your email address too.
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Even I faced this two times earlier, it too annoying, the most frustrating part is we can't put the used password again.
Yes @himanshu.. even though we had it secure one
We made to remember lot of passes by FB 
I have never experience it man! But i need to be cautious.. Thanks for letting us know about this..
Thanks for your comment @Tech-Freak, and you are welcome
So far… Still don't need this yet. Hopefully, won't need it.
Thanks for your comment @jayce, This may happen unexpectedly to any fb user. And the security done at FB end also pretty cool.
I got this message last Sunday and am trying to go through the steps to unlock my account. Only problem is the security code Facebook is supposed to send me never comes through to my email. Has anyone had this problem? If so, what have you done?? I've tried emailing various Facebook addresses and haven't gotten any answers!
Hi Rachel,
Facebook support system is the one that never responds..
similarly the facebook phone confirmation link. The phone system wont work fine with all the mobile service providers to receive the confirmation code. The one thing we can do is trying alternative mobile service providers within our region.
And for Email delivery, sorry to say you have to wait… The FB Email Delivery system is fast usually with its applications and other reminders but not with this account related things.
I am having the exact same issue as you. The security code never comes to my email. Have you gotten yours yet?? I have tried emailing several “customer service” addresses at Facebook and have gotten no help.
Twitter: _robinsonc
says:
Hi, this problem usually occurs if you are using Google Apps configured email.
Try the same with any other email service providers like yahoo, rediff or gmail.
Robin recently posted..iOS4 Available for Download
Oh my gosh the exact same thing has happened to me and I am so bloody frustrated with it. I have a hotmail account and but like the gmail users you mentioned no confirmation code ever comes through. I disabled cookies, emailed the fb help people AND tried changing my password multiple times but nothing has helped… :’(
scratch that! I finally managed to fix it: some fb addresses are blocked in hotmail (I’d say this goes for other email accounts too). Sure enough the one i needed was in the blocked section in my settings. After unblocking I was able to complete the account recovery process
i have this problem at the moment but when it asks me for the code i type it in and submit it.
it just asks me for it again and again and again. how can i fix it????
I got a similar problem. They texted me the code. However, I can’t type it (or anything else into the field provided in step 2). I’m stuck, any help is much appreciated.